Does the job!
NeverBounce - Real-time email verification and cleaning to ensure emails never bounce.
HubSpot - Grow Better With HubSpot: Software that's powerful, not overpowering. Seamlessly connect your data, teams, and customers on one CRM platform that grows with your business.
Email Verifier - Email verifier app lets you verify email.
ActiveCampaign - Integrated email marketing, marketing automation, and small business CRM. Send beautiful newsletters, setup behavioral based automations, and benefit from sales automation.
Email List Verify - The Fastest Way to Improve Email List Deliverability and ROI
Pardot - Salesforce B2B marketing automation